netdevsim: macsec: pad u64 to correct length in logs

netdevsim: macsec: pad u64 to correct length in logs

Commit 02b34d03a24b ("netdevsim: add dummy macsec offload") pads u64
number to 8 characters using "%08llx" format specifier.

Changing format specifier to "%016llx" ensures that no matter the value
the representation of number in log is always the same length.

Before this patch, entry in log for value '1' would say:
    removing SecY with SCI 00000001 at index 2
After this patch is applied, entry in log will say:
    removing SecY with SCI 0000000000000001 at index 2

Signed-off-by: Ales Nezbeda <anezbeda@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://patch.msgid.link/20241017131933.136971-1-anezbeda@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>